Assay device



FIG. 1 is a perspective view of the assay device;

FIG. 2 is an end view of a first end thereof;

FIG. 3 is an end view of a second end thereof;

FIG. 4 is a side view thereof with the opposite side view being a mirror image thereof; and,

FIG. 5 is a plan view thereof. 

The ornamental design for an assay device, as shown and described. 